Carrier Phase Reporting via Line-of-Sight Arrival-Path Selection
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Solution Overview
Problem
Existing carrier phase positioning technologies face ambiguity in reporting carrier phase measurements due to the first detected arrival path potentially being noise or interference, leading to inaccurate location estimation, as the actual first arrival path may have a lower line of sight indicator value.
Innovation Solution
Implementing options for reporting carrier phase measurements based on the largest line of sight indicator value or averaging multiple paths to ensure accurate reporting, including options for UE and gNB to prioritize or average measurements based on line of sight indicators, addressing UE ambiguous behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier phase measurement is reported for the first detected arrival path, then the positioning process is simple and fast, but the measurement accuracy deteriorates because the first detected path may be noise or interference rather than the actual first arrival path
Solution Approach 1:
The system performs preliminary detection of multiple arrival paths and their line of sight indicator values before selecting which path's carrier phase measurement to report. This preliminary action ensures that the actual first arrival path is identified and selected, rather than simply reporting the first detected path, thereby improving measurement accuracy without significantly impacting positioning speed
Solution Approach 2:
The system uses line of sight indicator values as feedback to evaluate and select the appropriate arrival path for carrier phase measurement reporting. By comparing the line of sight indicator values of multiple detected paths, the system can identify the actual first arrival path and report its measurement, resolving the ambiguity of whether the first detected path is truly the first arrival path
2Measurement precision
If multiple arrival paths are detected and evaluated based on line of sight indicator values, then measurement accuracy is improved, but the device complexity increases due to additional detection and evaluation processes
Solution Approach 1:
The line of sight indicator value determination process serves multiple functions: it characterizes the quality of each detected arrival path, enables selection of the actual first arrival path, and provides the basis for deciding whether to report carrier phase measurements. This multi-functionality reduces the need for separate dedicated processes, thereby limiting the increase in device complexity while achieving improved measurement accuracy
3Measurement precision
If carrier phase measurements are averaged across multiple paths, then positioning accuracy is improved, but the loss of information increases due to potential mixing of line of sight and non-line of sight path characteristics
Solution Approach 1:
Instead of uniformly averaging all detected paths, the system applies local quality assessment by evaluating the line of sight indicator values of individual paths. Only paths with appropriate line of sight characteristics are selected and averaged, ensuring that the averaging process preserves the integrity of line of sight path information while improving positioning accuracy through reduced measurement variance
Data Source
AI summary
An apparatus includes at least one processor; and at least one memory storing instructions that, when executed by the processor, cause the apparatus at least to: receive a request to report a carrier phase measurement for a first detected arrival signal path of a reference signal; detect multiple arrival signal paths from the reference signal including the first detected arrival signal path; determine line of sight indicator values for the detected multiple arrival signal paths including the first detected arrival signal path; and transmit, based on the determined line of sight indicator value for the first detected arrival signal path not being greater than at least one other line of sight indicator value for at least one other detected arrival signal path of the multiple arrival signal paths, a report comprising at least one carrier phase measurement for at least one arrival signal path of the multiple arrival signal paths.